Boiler.



PATENTED OCT. 27, 1903.

0. s. GARRETSON.

BOILER.

APPLICATION FILED NOV.20. 1902.

8 SHEETS-SHEET 1.

NO MODEL.

M HM Z ZM THE NOHRKS PETERS co, PHOTD-LITHQ. WASHINGTON. D. c.

vNo.742,30'6. I 'PATENTED 0.0127, 1903.

' 0. s. GARRETSON. Y

BOILER.

H APPLICATION FILED NOV. 20, 1902.

no MODEL. s SHEETS-SHEET a.

INVENTOR m: cams PETERS co, PHQIO-L'ITHO wunmsrou. nv c.

No. 742,306. PATENTED OCT. 27, 1903.

0. S. GARRETSON.

BOILER. 7

APPLICATION FILED NOV. 20, 1902.

N0 MODEL. 8 SHEETS-SHEET 4- in; Q Q Q Q Q Q C' m/mi m: uORms PETERS co,Puormnma, wnsmncrou, u. c.

PATENTED 0011.. 27, 1903.

0. s. GARRETSON.

BOILER.

APPLICATION ILED NOV.

Mums-SHEET 5.. I

N0 MODEL.

WITNESSES PATBNTED OCT. 27, 1903-, 0.-s. GARRETSON.

BOILER. APPLICATION FILED NOV. 20, 1902.

8 SHEETSSHEBT 0.

N0 MODEL.

Q/ IN VENTORv THE nunms I'EYERs 00,. Pnovc-urwa, WASHINGTON, n. c.

No.742,306. PATENTED 0GT.27 ,1903-.

' .0, s.- GARRETSON. 0

BOILER.

APPLICATION rum nov. 20. 1902. no MODEL. I 0 a snsmssunm 7,

OOOOOOOO 7? y? y L WITNESSES h -/jJNVENTOR Zia/Wa To all whom it mayconcern:

. shown in Fig. 9.

in. 742,3b.

I UNITED STATEs Patented October 2'7, 190.2.

PAT NT OFFICE.

BOILER $PECIFICATION forming part of Letters Patent No. 742,306, datedOctober 27, 1903.

" Application filed November 20, 19:02. Serial No. 182,109. (llo model.)

following is a f ull,'clear, and exact description, referencebeing hadto the accompany: ing drawings, forming part of this specifica -tion, in,Which--.

Figure 1 is asectional side elevation of the preferred form of boiler.Fig. 2 is a crosssection of the same. Fig. 3 is a partial top plan View.Fig. 4 is a sectional sideelevation of a modified form of boiler. Fig. 5isa cross section of part of the boiler, including the slag-dischargingapparatus;- and Fig. 6 is a side elevation of this portion of theapparatus. The figures on Sheets 5, 6, 7, and 8 illustrate another-formof boiler embodying my invention. Fig. 7 is a vertical longitudinalsection of the boiler. Fig. 8 is a transverse vertical section ontheline VIII VIII of Fig. 7. Fig. 9 is a fragmentary transverse verticalsection showing the boiler in end elevation. Fig. 10 is a plan view ofthe parts Fig. 11 is an enlarged fragmentary section through thewater-head on the line XI XI of Fig. 7. Fig. 12 is an enlarged detailsection on the line XII XII of Fig. 7. Fig. 13 is an enlarged detailsection on the line XIII XIII of Fig. 12, showing the steam-escape valveof one of the section.

The purpose of my invention is to provide a steam-boiler in which theheat is supplied by molten slag, such as is derived fromsmelting-furnaces, and the purpose which I accomplish is to provide aboiler in which the mechanical construction is simple and strong and inwhich efficient means are provided for the supply and discharge of theslag and the liberation of steam and in which corrosion of the boiler bythe slag is prevented.

The invention consists in its main features,

. briefly stated, of a rotary boiler or other heating apparatus havingin its peripheral Wall tn bes, pockets,or other suitable slag-receiverswhich receive the molten slag at'the upper side of the apparatus andhold it for a greater or less period of time until by the rotatingmovement of the apparatus the slagreceivers are inverted and thecongealed slag is discharged therefrom.

tions 2 2 and an intermediate steam-section Referring to Figs. 1, 2, 3,5, and 6, the boiler I is constructed with two tube-carrying sec- 3,each of annular form. The sections 2 2 5 ber of them can be arranged inthe boiler, and

for thepurpose of bracing the longer tubes 5 6 lateraliyI prefer toemploy annular bracingshells 8, concentric with'the sections 2 2 andheld therein by annular brackets or flanges 9. The tubes project throughthese shells and are braced thereby, but are free to ex pand andcontract longitudinally. The middle steam-section 3 of the boiler is ofgreater diameter than the sections 2 2 and may be clamped thereto byflanges 10 and bolts 11, and the ends or heads of the boiler 12 12 maybe similarly secured to the ends of the sections 2 2 and may be formedwith strengthen:

ing-flanges 12. The boiler thus constituted is supported on a cradlecomposed of rollers or wheels 13, bearing upon annular rims or tires 14,which may be applied to the boilershell, preferably tothe flangesthereof, or the rollers may be caused to bear directly upon suitableportions of the boiler-shell itself. These wheels render the boilerrotary on its longitudinal axis, and for the purpose of ro tating it orcontrolling its speed of rotation the boiler-shell is provided with anannular series of gear-teeth 15, meshing witha pinion 16, connected byworm-gearing 17 with a suitable motor. The' roller at one end of theboiler is flanged to serve as a guiding-roller, which is preferably atthe end of the boiler next to the gearing; but the other rollers areunflanged and permit free longitudinal ,expansion and contraction of theshell.

By supporting the boiler upon rotary surfaces instead of supporting iton trunnions the difficulties incident to heating of the bearings anddestruction of lubricant are avoid- 1 tubes 5, 6, and 7submergedthroughout their ed and many other advantages are obtained.

The feed-water pipe 18 and the steam-eduction pipe 19 extend axiallythrough the ends of the boiler. The inner end of the steameduction pipeextends vertically to the upper portion of the section 3, and its outerend extends in to a steam dome or receiver 20, which is provided with adrain-pipe 21 for withdrawing the water of condensation. The pipes 18and 19 do not rotate with the boiler, and at their passage through theends of the boiler they are provided with stuffing-boxes 22.

23 is a pipe which extends axially through the feed-pipe andcommunicates with a watergage 24.

The water-level of the boiler is shown in Fig. 1 and should be highenough tokeepthe tube-sections 2 2 full of water and the slaglength; butthe use of the middle section 3 of larger diameter enables me tomaintain this water-level and at the same time to afford a sufiicientsteam-space S in the upper portion of the boiler.

To supply the slag-tubes with slag for the purpose of heating thewater,a spout 25 is employed, through which the slag may be poured froma ladle or discharged from the furnaces. Its delivery nozzle is at theperiphery of the boiler,somewhat above the horizontal axis. It has aseries of gutters 25, one for each of the rows of tubes, and on theperiphery of the boiler there are short gutters 26, extending betweenthe openings of the tubes, so the slag which fails to run into oroverflows from one tube will flow into the next succeeding one.

The operation is as follows: The boiler having been filled with water tothe normal water-level, it is rotated slowly in the direction of thearrowsay at the rate of one revolution per hour,1nore or lessand slagischarged into the spout 25 and flows from the gutters 15 into the openends of the'tubes. Each line of tubes as it'comes opposite to theslagspout receives a charge of slag which communicates its heat to thewater through the walls of the tubes and solidifies and shrinks therein,so that the congealed body is of less crosssection than the bore of itstube. As the slag is poured into the tubes before they arrive at thevertical position, it will enter gradually and will not be apt by suddenheating to injure or corrode the metal. By placing the slag-spout at theside the slag flows into the tubes while they are inclined, so that thetubes will receive the slag readily and will not be filled above thelevel of the water at the innersurface of the boiler-shell. Burning ofthe ends of the tubes is thus prevented. As the tubes reach the level ofthe axis of the boiler on the opposite side from the slag-spout, theycome opposite to a shield 27, which extends concentrically with theperiphery of the boiler and terminates at a slag-discharge chute 28.This shield retains the solidified blocks of slag until they reach thedischarge 28; but at that place they drop from the tubes and fall into asuitable receptacle or con veyer.

To facilitate the discharge of the solidified slag from the tubes and toprovide against sticking thereof, the apparatus shown in detail in Figs.5 and 6 may be used, which, however, I do not specifically claim.Opposite to each annular line of tubes near the discharge-chute 28 is ajet-pipe 29, connected with a source of air, steam, or water, preferablywater. Each pipe has a valve 30, which as the tubes come in successionopposite to the pipe is engaged by a projection 31 on the boiler andbeing opened thereby discharges a cooling-jet under pressure into themouth of the tube against the slag. The rapid contraction of the slagwhich this occasions causes it to drop in pieces from the tube into thechute. As the tube moves on, the valve is closed automatically by aspring or other suitable means and shuts off the jet; but, if desired,the valves may be dispensed with and the jets rendered continuous.

The motor for rotating the boiler need only be used as a driving-motorat the beginning of the operation when the tubes are empty, for when thetubes are filled with slag, there being more charged tubes on one sideof the boiler than on the other or slag-discharge side, the boiler willbe rotated by the weight of the slag and the engine need only beemployed to regulate the speed of rotation.

Fig. 4 shows a modified construction in which only one tube-section 2 isemployed, the steam-section 3 of larger diameter being applied to theend of the section 2 and the heads 12 12 being applied to the outer endsof the sections 2 and 3, respectively. An external steam-drum 20 is madeto communicate not only with the steam-space, but also directly with thewater-space of the boiler through an annular passage 20, surrounding thesteam-pipe 19. The construction otherwise may be the same as shown inFig. 1. The steam-section 3 and the ends of the boiler may be covered bysuitable heat-insulating material. The advantages of this boiler will beappreciated by those skilled in the art. It possesses high efficiency,the slag is easily fed to and discharged from it, and it is soconstructed as to prevent corrosion or destruction of the tubes, whichare at all times in contact with the water. The boiler is therefore verydurable, and being supported on a cradle, as above described, it is notsubjected to mechanical strain and its rotation is rendered easy. Byvarying the speed of rotation or the supply of slag the rate ofgenerating the steam may be regulated as desired.

In the modification shown on Sheets 5 to 8 of thedrawings, A representsthe rotary steamboiler, provided centrally of its front and rear sideswith hollow trunuions a. a, which are journaled in bearings I),supported on horizontal beams B, which rest in the walls of theinclosing casing or housing 0. The rotary boiler is composed mainly of acentral cylindrical drum D and an annular series of chambers E, whichsurround said drum and primarily receive the water to be evaporated andthe molten slag for heating the same and discharge the steam and theexcess of unevaporated water into the central drum. The latter isprovided at its front or feed side with a hollow or double head d, towhich the trunnion a is secured, andat its rear side with a single head61, to which the trunnion a is secured. The hollow head 01 is divided byradial partitions or webs d into an annular series of segmentalwater-spaces (1 which receive the water at their inner ends and deliverit to the sections E at their outer ends. The chambers or sections E arearranged with their flat radial sides circumferentially side by side oragainst each other and are secured to the drum by any suitable ineansforinstance, by bolts f, which pass through front and rear flanges f on thebases or inner ends of the heating-chambers and 7 through annularflanges f on the front and otherwise.

'tudinal rows.

rear heads of the central'drum. Each of the heating-chambers E isprovided with a suitable number of slag tubes or receivers G, whichopenin the peripheral wall of the chamber and taperfrom the outer wall gtoward the inner wall 9 of the chamber to readily discharge thecongealed slag. The slag-receivers are closed at their inner ends,asshown in Fig. 13, and are preferablyarranged in longi- The inner ends ofsome of the tubes or receivers-for instance, the central row oftubes-may be secured to the inner wall g of the chamber in'any suitablemannor-for instance, by screwing the screwthreaded inner ends of theslag-tubes into the screw-threaded openings in the inner Wall of thechamber. The inner ends of these slag-tubes are closed by screw-plugs gor other suitable devices. Thesetubes being connected to the inner andouter walls of the chambers brace and stiffen the same and greatlyincrease the strength thereof. The remaining greater number ofslag-tubesin thechamber engage loosely in sockets g provided on theinner wallof the chamber and are closed at their inner ends by weldingor The major number of slag-tubes which are free at their inner ends arecapable of expanding or contracting without straining the water-chamber.Each of the waterchambers is provided at one end with aradially-arranged water pipe or passage J and at the other end wit-haradially-arranged steam pipe or passage K. The outer end of eachwater-pipe communicates with the ad-. jacent end of the water-chamber atthe outer portion thereof, as shown clearly in Fig. 7. The inner end ofeach water-pipe communicates with the radial Water-space d in the hollowhead cl of the central drum by means of holes provided in the outercircular wall of the hollow head, Figs. 7 and 11. Thus a waterway isprovided for each water-space of the hollow head d of the central drumto one or more of the water-chambers. Water is supplied to the rotaryhollow head (1 of the drum in any suitable or convenient manner. Asshown in the drawings, Fig. 7, a stationary water-pipe L is arrangedaxially in the hollow trunnion a, which is'secured to the hollow head ofthe drum. This pipe communicates at its outer end with a feed-pipe Z,and at its innerend the pipe is provided with a circular hollow head Z,which fits in a corresponding circular depression or hub in the centerof the hollow rotary head d. The peripheral wall of this stationary headis provided in its hollow rotary head turns on the fixed pipe- 7 headand is provided with ports Z each of which communicates with one of thewaterspaces 01 in the rotary head. As the boiler rotates the ports ofthe hollow head are successively brought into register with the ports inthe fixed pipe-head, and the feed-water is admitted to each water-spaceand to the water-chamber communicating therewith only when the latterare carried by the rotation of the boiler to the upper portion of theapparatus.

' 1 represents a stuffing-box of ordinary construction between the fixedwater-pipe and the rotating trunnion.

K represents a steam-pipe extending from the outer end of eachwater-chamber inwardly and communicating at its inner end by an openingit with the hollow central drum D. The inner end of each steam-pipe Kalso communicates by a passage 75 and a port 10 with the inner end ofthe water-chamber. The port 10 is controlled by gravity ball-valve M,which is confined in a radially-arranged cage 10 in the water-chamber.In the waterchatnbers which lie in the upper half of the boiler thevalves seat themselves bygravity and close the ports 70 so that watercannot escape from the water-chambers, while in the water-chambers whichlie in the lower'half of the boiler the valves drop away from theirseats and open the ports k so that any steam whichmay be formed in thelower waterchambers will rise and escape through the ports 70 to thecentral drum D.

M represents a steam-pipe which extends axially through the other hollowtrunnion a. of the boiler and is provided at its inner end with anupturned portion which extends nearly to the top of the hollow drum Dand is open-at its upper end. The steam-pipe M IIO The latter may, ifdesired, be connected to the feed-pipe for the boiler and a pump may beprovided for circulating the Water from the steam-drum to the feed-pipe,so that the water which accumulates in the steam-drum can be returned tothe boiler.

0 represents a blow-off pipe which extends axially through thefeed-water pipe into the hollow drum and is provided atits inner endwith a downturned portion which opens at its lower end in the hollowdrum D near the lower portion thereof.

The molten slag is fed by any suitable means to the tubes orslag-receivers of the several water-chambers successively as the latterare brought .by the rotation of the boiler to a position in which themolten slag can flow into the tubes or receivers. In the drawings ahopper H is shown at the upper portion or top of the inclosing case forthe boiler. This hopper fits closely with its open bottom against theperipheral wall of the boiler formed by the outer walls of-thewaterchambers. the hopper by a slag-spout h from the smelting-furnace.As the slag-tubes are carried beneath the open bottom of the hopper themolten slag flows from the latter into the open outer ends of the tubesand fills the same.

P represents the segmental shield, which is arranged beneath the lowerportion of the boiler, at one side thereof. (See Figs. 8 and 9.)

The boiler rotates slowly about its axis, and the filled slag-tubes arethereby slowly carried from the upper to the lower side of the boiler.During the slow rotative movement the slag in the tubes gives olf itsheat to the water surrounding the tubes, and when thelower side of theboileris reached, where the tubes are inverted, the slag has parted withthe bulk of its heat and has become congealed. In the inverted portionof the tubes the congealed slag tends to drop from the open outer endsof the tubes, but is prevented from doing so by the shield P until thetubes pass the lower end of the shield, when the pigs of congealed slagdrop from the tubes, as indicated by dotted lines in Fig. 8.

The means shown in Fig. 9 for regulating or retarding the rotation ofthe boiler consists of a worm-wheel Q, with which meshes aworm g, whichis secured to a transverse horizontal shaft q, mounted at its ends insuitable bearings g on the side walls of the inclosing casing or housingfor the boiler. The shaft q is provided with a sprocket-wheel or withany other suitable driving connection which through suitableinstrumentalities may be held so as to permit the shaft to rotate onlywith the desired slow speed. I

R is a conveyer which travels beneath a hopper R, arranged under theboiler. ceives and carries the discharged slag to the place ofdischarge. The steam which is formed in the outer or upper ends of thechambers escapes therefrom through the steam- The molten slag issupplied to pipes K, which conduct the steam, together with anyaccompanying water, from the outer ends of the chambers to the centralhollow drum D of the boiler. The steam passes from the drum through thesteam-pipe M to the stationary steam-drum, from which it is drawn forconsumption. If the water accumulates and rises in the hollow drum D, itenters the end of the steam-pipe M and passes therethrough to thesteam-drum, from which it may be drawn oif or returned to the feed pipe.

I am aware of the application filed by Ralph Baggaley on November 20,1902, Serial No.

132,131, describing and claiming certain parts of the apparatus hereinshown and broadly claimed by me, and I do not make specific claim to thematters claimed in said application.

Within the scope of my invention as defined in the claims the skilledmechanic will be able to vary the construction in many ways, since Ibelieve I am the first to devise a rotary boiler, or a boiler in whichthe slag is discharged by inverting the boiler.

I claim 1. Arotaryboiler rotatively mounted on its supports and havingslag-receivers which are open at one end for receiving the molten slagand which are inverted by the rotary movementof the apparatus fordischarging the congealed slag; substantially as described.

2. A rotary boiler having slag-receivers which open in the peripheralwall of the apparatus and which are inverted by the rotary movement ofthe apparatus for discharging the congealed slag at the lower side ofthe apparatus, and means for supplying the molten slag to the receiversabove the axis of rotation; substantially as described.

3. A rotary boiler, rotatively mounted on its supports and havingslag-receivers which are open at one end for receiving the molten slagand which taper inwardly and are inverted by the rotary movement of theapparatus for discharging the congealed slag; substantially asdescribed.

4:. The combination of a movable heatingchamber provided with one ormore slag-tubes open at one end, means for supplying molten slag to saidtubes, and means for inverting said chamber to discharge the congealedslag; substantially as described.

5. The combination of a heating-chamber mounted to rotate, and providedwith one or more slag-tubes open at one end, means above the axis ofrotation of said heating-chamber for supplying molten slag to saidtubes, and means for retaining the slag in said tubes during therotation of said chamber until the point of discharge is reached;substantially as described.

6. The combination of a heating-chamber mounted to rotate and providedwith one or more slag-tubes open at one end, means for supplying moltenslag to said tubes at a point above the axis of rotation of said heatingICC - plying molten slag successively to the receivers above the axis ofrotation, means for retaining the slag in each receiver until the .pointof discharge below the axis of rotation is reached, and means forcontrolling the rotary effect of the weighted side of the apparatuswhich contains the filled slag-receivers; substantially as described.

8. A steam-boiler rotary on a horizontal axis and havinginwardly-projecting receptacles for the reception and discharge of slag,and a steam-space extending outwardly beyond the receptacles;substantially as described.

9. A steam-boiler rotary on a horizontal axis and having receptacles forthe reception and discharge of slag, said boiler being mounted on rotarysupporting-surfaces; substantially as described.

10. A steam-boiler rotary on a horizontal axis and having receptaclesfor the reception and discharge of slag, said boiler being mounted onrotary supporting-surfaces, and a motor in gear with the boiler;substantially as described.

I 11. Arotarysteam-boiler rotativelymounted on its supports andcomprising a hollow rotary shell adapted to be charged with water,slag-tubes attached to the shell and procomposed of laterally-adjoinedsections; sub- I stantially as described.

13.A steam-boiler rotary on a horizontal axis and comprising a hollowrotary shell composed of laterally-adjoined sections, one of whichextends outwardly beyond the other and constitutes a steam-space;substantially as described.

14. ArotarysteaLn-boiler rotatively mounted on its supports andcomprising a hollow shell, and slag-tubes expanded in the shell andprojecting thereinto substantially as described.

15. A rotary steam-boiler rotativel y mounted on its supports andcomprising a hollow shell, and slag-tubes expanded in the shell andprojecting thereinto, said tubes being of difierent lengths and arrangedradially; substantially as described.

16. A rotary steam-boiler comprising a hollow shell, slag-tubes expandedin the shell and projecting thereinto, and an internal brace holding thetubes and adapted to permit longitudinal expansion substantially asdescribed.

In testimony whereof I have hereunto set my hand.

OLIVER S. GARRETSON.

Witnesses:

EDWARD WILHELM, H. M. CoRwIN.

